<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
<script type="text/javascript">
	
	function test () {
		document.getElementsByTagName("body")[0].innerHTML = '<img alt="beatiful" src="san.gif" width="100%" height="100%">';	
	}
	setTimeout("test()", 5000);

</script>
</head>
<body>

	<h1>美女来了！！！</h1>
	

</body>
</html>